type
type:
| "anchor"
| "tag"
| "space"
| "comment"
| "newline"
| "byte-order-mark"
| "doc-mode"
| "doc-start"
| "directive-line"
| "seq-item-ind"
| "explicit-key-ind"
| "map-value-ind"
| "flow-map-start"
| "flow-map-end"
| "flow-seq-start"
| "flow-seq-end"
| "flow-error-end"
| "comma"
| "block-scalar-header"